高斯型耦合下运动原子与压缩真空场的纠缠特性  

Quantum entanglement between squeezing vacuum state field and moving atom with Gaussian coupling

作　　者：张春强[1] 谢芳森[2] 饶志明[1] 

机构地区：[1]江西中医学院,江西南昌310004 [2]江西师范大学,江西南昌330022

出　　处：《激光杂志》2014年第1期15-17,共3页Laser Journal

摘　　要：研究了当耦合系数为高斯型分布时运动原子与压缩真空场的纠缠特性,讨论了原子垂直于腔轴的运动、原子初态、压缩参数r对纠缠度的影响。结果发现:原子速度的增大会使原子与光场的有效作用时间变短,纠缠度也将很快达到最大值。压缩参数r对纠缠度的演化曲线有明显的调制作用,当压缩参数取适当值(如r=2)时,系统可长久停留在最大纠缠态,无消纠缠态或持续地处于消纠缠态。The properties of the entanglement between squeezing vacuum state field and moving atom with Gaussian coupling are studied. The influence of atomic motion perpendicularity to the axes of resonant cavity, the initial states of atom, the squeez- ing parameter on entanglement degree are discussed. The results show that： with the increase of atomic velocity, effective interac- tion time of the atom and field will shorten, the entanglement degree will also reach the maximum quickly. The squeezing parame- ter r have a obvious role of concocting the evolution curve of degree of entanglement, if the squeezing parameter is take appropri- ate value（such as r = 2 ）, the system of quantum state will be maximally entangled state for a long time, without disentangled-free state or disentangled state, and the de^ree of entanglement is stationary.

关 键 词：量子纠缠 压缩真空态 高斯型耦合系数 VonNeuman熵 

分 类 号：O431.2[机械工程—光学工程]